{"id":2171,"date":"2025-03-24T08:48:06","date_gmt":"2025-03-23T23:48:06","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=2171"},"modified":"2025-03-24T08:48:31","modified_gmt":"2025-03-23T23:48:31","slug":"c%e3%81%ae%e3%83%95%e3%83%ad%e3%82%a2%e9%96%a2%e6%95%b0%e5%ae%8c%e5%85%a8%e3%82%ac%e3%82%a4%e3%83%89%ef%bc%9a7%e3%81%a4%e3%81%ae%e5%ae%9f%e8%b7%b5%e7%9a%84%e3%81%aa%e4%bd%bf%e7%94%a8%e4%be%8b","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=2171","title":{"rendered":"C++\u306e\u30d5\u30ed\u30a2\u95a2\u6570\u5b8c\u5168\u30ac\u30a4\u30c9\uff1a7\u3064\u306e\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u4f8b\u3068\u6ce8\u610f\u70b9"},"content":{"rendered":"\n<div class=\"toc\"><br \/>\n<b>Warning<\/b>:  Undefined array key \"is_admin\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>116<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_category_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>121<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>128<\/b><br \/>\n    <div id=\"toc_container\" class=\"sgb-toc--bullets js-smooth-scroll\" data-dialog-title=\"\u76ee\u6b21\">\n      <p class=\"toc_title\">\u76ee\u6b21 <\/p>\n      <ul class=\"toc_list\">  <li class=\"first\">    <a href=\"#i-0\">C++\u306efloor\u95a2\u6570\u3068\u306f\uff1a\u57fa\u790e\u304b\u3089\u5fdc\u7528\u307e\u3067<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">floor\u95a2\u6570\u306e\u57fa\u672c\u7684\u306a\u52d5\u4f5c\u3068\u623b\u308a\u5024\u306e\u578b<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-2\">cmath\u30d8\u30c3\u30c0\u30fc\u30d5\u30a1\u30a4\u30eb\u306e\u6b63\u3057\u3044\u4f7f\u7528\u65b9\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-3\">floor\u95a2\u6570\u306e\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u4f8b<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-4\">\u6574\u6570\u90e8\u5206\u306e\u62bd\u51fa\u306b\u3088\u308b\u5c0f\u6570\u70b9\u4ee5\u4e0b\u306e\u5207\u308a\u6368\u3066<\/a>      <\/li>      <li>        <a href=\"#i-5\">\u8ca0\u306e\u6570\u5024\u306b\u304a\u3051\u308bfloor\u95a2\u6570\u306e\u6319\u52d5\u3068\u6ce8\u610f\u70b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-6\">\u7570\u306a\u308b\u6570\u5024\u578b\uff08float\u3001double\u3001long double\uff09\u3067\u306e\u4f7f\u7528\u65b9\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-7\">floor\u95a2\u6570\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-8\">\u30ad\u30e3\u30b9\u30c8\u3068\u6bd4\u8f03\u3057\u305f\u969b\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u8a55\u4fa1<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-9\">\u30b3\u30f3\u30d1\u30a4\u30e9\u306e\u6700\u9069\u5316\u30aa\u30d7\u30b7\u30e7\u30f3\u306b\u3088\u308b\u5f71\u97ff<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-10\">\u30d5\u30ed\u30a2\u95a2\u6570\u306e\u4ee3\u66ff\u624b\u6bb5\u3068\u6bd4\u8f03<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-11\">\u6574\u6570\u30ad\u30e3\u30b9\u30c8\u3068\u30d5\u30ed\u30a2\u95a2\u6570\u306e\u9055\u3044<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-12\">trunc\u95a2\u6570\u3068\u306e\u4f7f\u3044\u5206\u3051<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-13\">\u4e00\u822c\u7684\u306a\u30a8\u30e9\u30fc\u3068\u89e3\u6c7a\u65b9\u6cd5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-14\">\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306e\u4e3b\u306a\u539f\u56e0\u3068\u5bfe\u51e6\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-15\">\u7cbe\u5ea6\u306e\u554f\u984c\u3068\u6d6e\u52d5\u5c0f\u6570\u70b9\u6f14\u7b97\u306e\u6ce8\u610f\u70b9<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-16\">\u5b9f\u52d9\u3067\u306e\u6d3b\u7528\u4e8b\u4f8b<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-17\">\u91d1\u878d\u8a08\u7b97\u3067\u306e\u6b63\u78ba\u306a\u6570\u5024\u306e\u5207\u308a\u6368\u3066\u51e6\u7406<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-18\">\u30b0\u30e9\u30d5\u30a3\u30c3\u30af\u30b9\u51e6\u7406\u3067\u306e\u5ea7\u6a19\u8a08\u7b97\u306b\u304a\u3051\u308b\u4f7f\u7528\u4f8b<\/a>      <\/li>    <\/ul>  <\/li><\/ul>\n      <a href=\"#\" class=\"sgb-toc-button js-toc-button\" rel=\"nofollow\" data-open-dialog=\"true\"><i class=\"fa fa-list\"><\/i><span class=\"sgb-toc-button__text\">\u76ee\u6b21\u3078<\/span><\/a>\n    <\/div><\/div><h2 class=\"wp-block-heading\" id=\"i-0\">C++\u306efloor\u95a2\u6570\u3068\u306f\uff1a\u57fa\u790e\u304b\u3089\u5fdc\u7528\u307e\u3067<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">floor\u95a2\u6570\u306e\u57fa\u672c\u7684\u306a\u52d5\u4f5c\u3068\u623b\u308a\u5024\u306e\u578b<\/h3>\n\n\n\n<p>floor\u95a2\u6570\u306f\u3001C++\u306e\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea<code>cmath<\/code>\u306b\u542b\u307e\u308c\u308b\u6570\u5b66\u95a2\u6570\u306e\u4e00\u3064\u3067\u3001\u4e0e\u3048\u3089\u308c\u305f\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u4ee5\u4e0b\u306e\u6700\u5927\u306e\u6574\u6570\uff08\u5e8a\u95a2\u6570\uff09\u3092\u8fd4\u3057\u307e\u3059\u3002\u5177\u4f53\u7684\u306b\u306f\u3001\u5165\u529b\u5024\u4ee5\u4e0b\u306e\u6700\u3082\u8fd1\u3044\u6574\u6570\u5024\u3092\u8a08\u7b97\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;cmath&gt;\n#include &lt;iostream&gt;\n\nint main() {\n    \/\/ \u57fa\u672c\u7684\u306a\u4f7f\u7528\u4f8b\n    double x = 3.7;\n    double result = floor(x);  \/\/ result = 3.0\n    std::cout &lt;&lt; \"floor(\" &lt;&lt; x &lt;&lt; \") = \" &lt;&lt; result &lt;&lt; std::endl;\n\n    \/\/ \u8ca0\u306e\u6570\u306e\u5834\u5408\n    double y = -3.7;\n    double result2 = floor(y);  \/\/ result2 = -4.0\n    std::cout &lt;&lt; \"floor(\" &lt;&lt; y &lt;&lt; \") = \" &lt;&lt; result2 &lt;&lt; std::endl;\n}<\/pre>\n\n\n\n<p>floor\u95a2\u6570\u306e\u91cd\u8981\u306a\u7279\u5fb4\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u623b\u308a\u5024\u306e\u578b\uff1adouble\u578b<\/li>\n\n\n\n<li>\u5f15\u6570\u306e\u578b\uff1afloat, double, long double\u306b\u5bfe\u5fdc<\/li>\n\n\n\n<li>\u5e38\u306b\u5165\u529b\u5024\u4ee5\u4e0b\u306e\u6700\u5927\u306e\u6574\u6570\u3092\u8fd4\u3059<\/li>\n\n\n\n<li>\u6574\u6570\u5024\u304c\u5165\u529b\u3055\u308c\u305f\u5834\u5408\u306f\u305d\u306e\u5024\u3092\u305d\u306e\u307e\u307e\u8fd4\u3059<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">cmath\u30d8\u30c3\u30c0\u30fc\u30d5\u30a1\u30a4\u30eb\u306e\u6b63\u3057\u3044\u4f7f\u7528\u65b9\u6cd5<\/h3>\n\n\n\n<p><code>cmath<\/code>\u30d8\u30c3\u30c0\u30fc\u30d5\u30a1\u30a4\u30eb\u306f\u3001C++\u306e\u6570\u5b66\u95a2\u6570\u3092\u63d0\u4f9b\u3059\u308b\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u3059\u3002floor\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u6b63\u3057\u3044\u5b9f\u88c5\u65b9\u6cd5\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;cmath&gt;   \/\/ \u73fe\u4ee3\u7684\u306aC++\u3067\u306e\u63a8\u5968\u5f62\u5f0f\n\/\/ #include &lt;math.h&gt; \/\/ \u53e4\u3044C\u8a00\u8a9e\u5f62\u5f0f\uff08\u975e\u63a8\u5968\uff09\n\nint main() {\n    \/\/ \u7570\u306a\u308b\u578b\u3067\u306e\u4f7f\u7528\u4f8b\n    float f_num = 2.8f;\n    double d_num = 2.8;\n    long double ld_num = 2.8L;\n\n    \/\/ \u5404\u578b\u306b\u5bfe\u3059\u308bfloor\u95a2\u6570\u306e\u4f7f\u7528\n    float f_result = std::floor(f_num);      \/\/ float\u578b\u306e\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\n    double d_result = std::floor(d_num);     \/\/ double\u578b\u306e\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\n    long double ld_result = std::floor(ld_num); \/\/ long double\u578b\u306e\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\n\n    \/\/ \u540d\u524d\u7a7a\u9593\u306e\u660e\u793a\u7684\u306a\u4f7f\u7528\n    using std::floor;  \/\/ \u500b\u5225\u306e\u95a2\u6570\u306e\u307f\u3092using\u5ba3\u8a00\n    double result = floor(3.14);  \/\/ std::\u3092\u7701\u7565\u53ef\u80fd\n}<\/pre>\n\n\n\n<p>floor\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u63a8\u5968\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>std::<\/code>\u540d\u524d\u7a7a\u9593\u3092\u660e\u793a\u7684\u306b\u4f7f\u7528\u3059\u308b<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u578b\u306e\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3092\u9078\u629e\u3059\u308b<\/li>\n\n\n\n<li>\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u578b\u30ad\u30e3\u30b9\u30c8\u3092\u4f7f\u7528\u3059\u308b<\/li>\n<\/ul>\n\n\n\n<p>\u6ce8\u610f\u70b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><code>math.h<\/code>\u3088\u308a<code>cmath<\/code>\u3092\u4f7f\u7528\u3059\u308b<\/li>\n\n\n\n<li>\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306e\u7cbe\u5ea6\u306b\u6ce8\u610f\u3059\u308b<\/li>\n\n\n\n<li>\u30b3\u30f3\u30d1\u30a4\u30e9\u306e\u6700\u9069\u5316\u30aa\u30d7\u30b7\u30e7\u30f3\u306b\u6ce8\u610f\u3059\u308b<\/li>\n<\/ol>\n\n\n\n<p>\u3053\u306e\u57fa\u672c\u7684\u306a\u7406\u89e3\u306f\u3001\u3088\u308a\u9ad8\u5ea6\u306afloor\u95a2\u6570\u306e\u4f7f\u7528\u65b9\u6cd5\u3092\u5b66\u3076\u4e0a\u3067\u306e\u91cd\u8981\u306a\u57fa\u76e4\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-3\">floor\u95a2\u6570\u306e\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u4f8b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-4\">\u6574\u6570\u90e8\u5206\u306e\u62bd\u51fa\u306b\u3088\u308b\u5c0f\u6570\u70b9\u4ee5\u4e0b\u306e\u5207\u308a\u6368\u3066<\/h3>\n\n\n\n<p>floor\u95a2\u6570\u3092\u4f7f\u7528\u3057\u305f\u6574\u6570\u90e8\u5206\u306e\u62bd\u51fa\u306f\u3001\u6570\u5024\u8a08\u7b97\u3084\u91d1\u878d\u8a08\u7b97\u3067\u983b\u7e41\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u5177\u4f53\u7684\u306a\u5b9f\u88c5\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;cmath&gt;\n#include &lt;iostream&gt;\n#include &lt;iomanip&gt;\n\nint main() {\n    \/\/ \u57fa\u672c\u7684\u306a\u5c0f\u6570\u70b9\u4ee5\u4e0b\u306e\u5207\u308a\u6368\u3066\n    double price = 1234.56;\n    double floor_price = std::floor(price);\n\n    std::cout &lt;&lt; std::fixed &lt;&lt; std::setprecision(2);\n    std::cout &lt;&lt; \"\u5143\u306e\u4fa1\u683c: \" &lt;&lt; price &lt;&lt; std::endl;\n    std::cout &lt;&lt; \"\u5207\u308a\u6368\u3066\u5f8c: \" &lt;&lt; floor_price &lt;&lt; std::endl;\n\n    \/\/ \u5c0f\u6570\u70b9\u7b2c2\u4f4d\u307e\u3067\u306e\u5024\u3092\u4fdd\u6301\u3059\u308b\u4f8b\n    double scale = 100.0;\n    double rounded = std::floor(price * scale) \/ scale;\n    std::cout &lt;&lt; \"\u5c0f\u6570\u7b2c2\u4f4d\u307e\u3067\u306e\u5207\u308a\u6368\u3066: \" &lt;&lt; rounded &lt;&lt; std::endl;\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-5\">\u8ca0\u306e\u6570\u5024\u306b\u304a\u3051\u308bfloor\u95a2\u6570\u306e\u6319\u52d5\u3068\u6ce8\u610f\u70b9<\/h3>\n\n\n\n<p>\u8ca0\u306e\u6570\u5024\u306b\u5bfe\u3059\u308bfloor\u95a2\u6570\u306e\u52d5\u4f5c\u306f\u3001\u76f4\u611f\u7684\u306b\u7406\u89e3\u3057\u3065\u3089\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3067\u3001\u305d\u306e\u7279\u5fb4\u7684\u306a\u6319\u52d5\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;cmath&gt;\n#include &lt;iostream&gt;\n\nvoid demonstrate_negative_floor() {\n    double values[] = {-3.1, -3.5, -3.7, -4.0};\n\n    for (double val : values) {\n        double floor_val = std::floor(val);\n        std::cout &lt;&lt; \"floor(\" &lt;&lt; val &lt;&lt; \") = \" &lt;&lt; floor_val &lt;&lt; std::endl;\n\n        \/\/ \u6574\u6570\u30ad\u30e3\u30b9\u30c8\u3068\u306e\u6bd4\u8f03\n        int cast_val = static_cast&lt;int&gt;(val);\n        std::cout &lt;&lt; \"static_cast&lt;int&gt;(\" &lt;&lt; val &lt;&lt; \") = \" &lt;&lt; cast_val &lt;&lt; std::endl;\n        std::cout &lt;&lt; \"-------------------\" &lt;&lt; std::endl;\n    }\n}\n\nint main() {\n    demonstrate_negative_floor();\n    return 0;\n}<\/pre>\n\n\n\n<p>\u6ce8\u610f\u70b9\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8ca0\u306e\u6570\u3067\u306f\u3001floor\u95a2\u6570\u306f\u6b21\u306e\u5c0f\u3055\u3044\u6574\u6570\u306b\u4e38\u3081\u307e\u3059<\/li>\n\n\n\n<li>\u6574\u6570\u30ad\u30e3\u30b9\u30c8\u3068\u306f\u7570\u306a\u308b\u7d50\u679c\u306b\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059<\/li>\n\n\n\n<li>\u91d1\u878d\u8a08\u7b97\u3067\u306f\u7279\u306b\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-6\">\u7570\u306a\u308b\u6570\u5024\u578b\uff08float\u3001double\u3001long double\uff09\u3067\u306e\u4f7f\u7528\u65b9\u6cd5<\/h3>\n\n\n\n<p>floor\u95a2\u6570\u306f\u69d8\u3005\u306a\u6d6e\u52d5\u5c0f\u6570\u70b9\u578b\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u3059\u3002\u578b\u306b\u3088\u308b\u9055\u3044\u3068\u7cbe\u5ea6\u306e\u9055\u3044\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;cmath&gt;\n#include &lt;iostream&gt;\n#include &lt;iomanip&gt;\n\nvoid compare_numeric_types() {\n    \/\/ \u5404\u578b\u3067\u306e\u7cbe\u5ea6\u306e\u9055\u3044\u3092\u793a\u3059\n    float f_val = 123456.789f;\n    double d_val = 123456.789;\n    long double ld_val = 123456.789L;\n\n    std::cout &lt;&lt; std::fixed &lt;&lt; std::setprecision(6);\n\n    \/\/ float\u578b\u3067\u306e\u8a08\u7b97\n    float f_floor = std::floor(f_val);\n    std::cout &lt;&lt; \"float: \" &lt;&lt; f_val &lt;&lt; \" -&gt; \" &lt;&lt; f_floor &lt;&lt; std::endl;\n\n    \/\/ double\u578b\u3067\u306e\u8a08\u7b97\n    double d_floor = std::floor(d_val);\n    std::cout &lt;&lt; \"double: \" &lt;&lt; d_val &lt;&lt; \" -&gt; \" &lt;&lt; d_floor &lt;&lt; std::endl;\n\n    \/\/ long double\u578b\u3067\u306e\u8a08\u7b97\n    long double ld_floor = std::floor(ld_val);\n    std::cout &lt;&lt; \"long double: \" &lt;&lt; ld_val &lt;&lt; \" -&gt; \" &lt;&lt; ld_floor &lt;&lt; std::endl;\n}\n\nint main() {\n    compare_numeric_types();\n    return 0;\n}<\/pre>\n\n\n\n<p>\u5b9f\u88c5\u6642\u306e\u6ce8\u610f\u70b9\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9069\u5207\u306a\u578b\u306e\u9078\u629e\u304c\u91cd\u8981<\/li>\n\n\n\n<li>\u7cbe\u5ea6\u306e\u8981\u4ef6\u306b\u5fdc\u3058\u3066\u578b\u3092\u9078\u629e<\/li>\n\n\n\n<li>\u6697\u9ed9\u306e\u578b\u5909\u63db\u306b\u6ce8\u610f<\/li>\n\n\n\n<li>\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u306e\u53ef\u80fd\u6027\u3092\u8003\u616e<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u5b9f\u8df5\u7684\u306a\u4f8b\u3092\u901a\u3058\u3066\u3001floor\u95a2\u6570\u306e\u5b9f\u969b\u306e\u4f7f\u7528\u65b9\u6cd5\u3068\u6ce8\u610f\u70b9\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u7279\u306b\u91d1\u878d\u8a08\u7b97\u3084\u30b0\u30e9\u30d5\u30a3\u30c3\u30af\u30b9\u51e6\u7406\u306a\u3069\u3001\u7cbe\u5ea6\u304c\u91cd\u8981\u306a\u5834\u9762\u3067\u306f\u3001\u9069\u5207\u306a\u578b\u306e\u9078\u629e\u3068\u7cbe\u5ea6\u306e\u7ba1\u7406\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-7\">floor\u95a2\u6570\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-8\">\u30ad\u30e3\u30b9\u30c8\u3068\u6bd4\u8f03\u3057\u305f\u969b\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u8a55\u4fa1<\/h3>\n\n\n\n<p>floor\u95a2\u6570\u3068\u6574\u6570\u30ad\u30e3\u30b9\u30c8\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6bd4\u8f03\u3057\u3001\u305d\u308c\u305e\u308c\u306e\u7279\u5fb4\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u306f\u91cd\u8981\u3067\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u30b3\u30fc\u30c9\u3068\u5206\u6790\u7d50\u679c\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;cmath&gt;\n#include &lt;chrono&gt;\n#include &lt;iostream&gt;\n#include &lt;vector&gt;\n\n\/\/ \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6e2c\u5b9a\u7528\u95a2\u6570\ntemplate&lt;typename Func&gt;\ndouble measure_time(Func func, int iterations) {\n    auto start = std::chrono::high_resolution_clock::now();\n    for (int i = 0; i &lt; iterations; i++) {\n        func();\n    }\n    auto end = std::chrono::high_resolution_clock::now();\n    return std::chrono::duration&lt;double&gt;(end - start).count();\n}\n\nint main() {\n    const int ITERATIONS = 10000000;\n    std::vector&lt;double&gt; values(1000);\n\n    \/\/ \u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u306e\u751f\u6210\n    for (int i = 0; i &lt; values.size(); i++) {\n        values[i] = i * 0.1;\n    }\n\n    \/\/ floor\u95a2\u6570\u306e\u30d9\u30f3\u30c1\u30de\u30fc\u30af\n    auto floor_test = [&amp;]() {\n        double sum = 0;\n        for (const auto&amp; val : values) {\n            sum += std::floor(val);\n        }\n        return sum;\n    };\n\n    \/\/ \u9759\u7684\u30ad\u30e3\u30b9\u30c8\u306e\u30d9\u30f3\u30c1\u30de\u30fc\u30af\n    auto cast_test = [&amp;]() {\n        double sum = 0;\n        for (const auto&amp; val : values) {\n            sum += static_cast&lt;int&gt;(val);\n        }\n        return sum;\n    };\n\n    \/\/ \u6e2c\u5b9a\u5b9f\u884c\n    double floor_time = measure_time(floor_test, ITERATIONS);\n    double cast_time = measure_time(cast_test, ITERATIONS);\n\n    std::cout &lt;&lt; \"floor\u95a2\u6570\u306e\u5b9f\u884c\u6642\u9593: \" &lt;&lt; floor_time &lt;&lt; \"\u79d2\\n\";\n    std::cout &lt;&lt; \"\u9759\u7684\u30ad\u30e3\u30b9\u30c8\u306e\u5b9f\u884c\u6642\u9593: \" &lt;&lt; cast_time &lt;&lt; \"\u79d2\\n\";\n    std::cout &lt;&lt; \"\u6bd4\u7387(floor\/cast): \" &lt;&lt; floor_time\/cast_time &lt;&lt; \"\\n\";\n}<\/pre>\n\n\n\n<p>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6bd4\u8f03\u7d50\u679c\uff1a<\/p>\n\n\n<div id=\"id-7c80e7e5-a28e-4294-839e-c26629938030\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u624b\u6cd5<\/th><th>\u76f8\u5bfe\u7684\u306a\u51e6\u7406\u901f\u5ea6<\/th><th>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf<\/th><th>\u7cbe\u5ea6<\/th><\/tr><\/thead><tbody><tr><td>floor\u95a2\u6570<\/td><td>1.0\uff08\u57fa\u6e96\uff09<\/td><td>\u6a19\u6e96\u7684<\/td><td>\u9ad8\u7cbe\u5ea6<\/td><\/tr><tr><td>\u9759\u7684\u30ad\u30e3\u30b9\u30c8<\/td><td>\u7d041.2-1.5\u500d\u9ad8\u901f<\/td><td>\u6700\u5c0f<\/td><td>\u5207\u308a\u6368\u3066\u306e\u307f<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"i-9\">\u30b3\u30f3\u30d1\u30a4\u30e9\u306e\u6700\u9069\u5316\u30aa\u30d7\u30b7\u30e7\u30f3\u306b\u3088\u308b\u5f71\u97ff<\/h3>\n\n\n\n<p>\u30b3\u30f3\u30d1\u30a4\u30e9\u306e\u6700\u9069\u5316\u30aa\u30d7\u30b7\u30e7\u30f3\u306ffloor\u95a2\u6570\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u5927\u304d\u306a\u5f71\u97ff\u3092\u4e0e\u3048\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u4e3b\u306a\u6700\u9069\u5316\u30aa\u30d7\u30b7\u30e7\u30f3\u3068\u305d\u306e\u52b9\u679c\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;cmath&gt;\n#include &lt;iostream&gt;\n\n\/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30aa\u30d7\u30b7\u30e7\u30f3\u4f8b\uff1a\n\/\/ g++ -O0 program.cpp -o program_no_opt\n\/\/ g++ -O2 program.cpp -o program_opt\n\/\/ g++ -O3 -ffast-math program.cpp -o program_fast_math\n\nvoid optimize_floor_operations() {\n    const int ARRAY_SIZE = 1000000;\n    std::vector&lt;double&gt; values(ARRAY_SIZE);\n    std::vector&lt;double&gt; results(ARRAY_SIZE);\n\n    \/\/ \u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u306e\u521d\u671f\u5316\n    for (int i = 0; i &lt; ARRAY_SIZE; i++) {\n        values[i] = i * 0.1;\n    }\n\n    \/\/ \u6700\u9069\u5316\u3055\u308c\u308bfloor\u64cd\u4f5c\n    #pragma optimize(\"\", on)\n    for (int i = 0; i &lt; ARRAY_SIZE; i++) {\n        results[i] = std::floor(values[i]);\n    }\n    #pragma optimize(\"\", off)\n}<\/pre>\n\n\n\n<p>\u6700\u9069\u5316\u30aa\u30d7\u30b7\u30e7\u30f3\u306e\u52b9\u679c\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>-O0\uff08\u6700\u9069\u5316\u306a\u3057\uff09<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30c7\u30d0\u30c3\u30b0\u6642\u306b\u63a8\u5968<\/li>\n\n\n\n<li>\u5b9f\u884c\u901f\u5ea6\u306f\u6700\u3082\u9045\u3044<\/li>\n\n\n\n<li>\u30b3\u30fc\u30c9\u6539\u5909\u306a\u3057<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>-O2\uff08\u6a19\u6e96\u7684\u306a\u6700\u9069\u5316\uff09<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b9f\u884c\u901f\u5ea6\u304c\u7d0430-50%\u5411\u4e0a<\/li>\n\n\n\n<li>\u5b89\u5168\u306a\u6700\u9069\u5316\u306e\u307f\u5b9f\u884c<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3082\u6700\u9069\u5316<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>-O3 -ffast-math\uff08\u7a4d\u6975\u7684\u306a\u6700\u9069\u5316\uff09<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6700\u592780%\u307e\u3067\u306e\u901f\u5ea6\u5411\u4e0a<\/li>\n\n\n\n<li>IEEE-754\u53b3\u5bc6\u6027\u306f\u640d\u306a\u308f\u308c\u308b<\/li>\n\n\n\n<li>\u7279\u6b8a\u306a\u30b1\u30fc\u30b9\u3067\u8aa4\u5dee\u767a\u751f\u306e\u53ef\u80fd\u6027<\/li>\n<\/ul>\n\n\n\n<p>\u6700\u9069\u5316\u306b\u304a\u3051\u308b\u6ce8\u610f\u70b9\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30c7\u30d0\u30c3\u30b0\u30d3\u30eb\u30c9\u3068\u672c\u756a\u30d3\u30eb\u30c9\u3067\u52d5\u4f5c\u304c\u7570\u306a\u308b\u53ef\u80fd\u6027<\/li>\n\n\n\n<li>-ffast-math\u30aa\u30d7\u30b7\u30e7\u30f3\u306f\u7cbe\u5ea6\u3068\u5f15\u304d\u63db\u3048\u306b\u9ad8\u901f\u5316<\/li>\n\n\n\n<li>\u30d7\u30ed\u30d5\u30a1\u30a4\u30ea\u30f3\u30b0\u30c4\u30fc\u30eb\u3092\u4f7f\u7528\u3057\u305f\u691c\u8a3c\u304c\u63a8\u5968<\/li>\n\n\n\n<li>\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u56fa\u6709\u306e\u6700\u9069\u5316\u306e\u8003\u616e<\/li>\n<\/ul>\n\n\n\n<p>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u4f7f\u7528\u76ee\u7684\u306b\u5fdc\u3058\u305f\u9069\u5207\u306a\u6700\u9069\u5316\u30ec\u30d9\u30eb\u306e\u9078\u629e<\/li>\n\n\n\n<li>\u30d7\u30ed\u30d5\u30a1\u30a4\u30ea\u30f3\u30b0\u306b\u3088\u308b\u5b9f\u969b\u306e\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u306e\u7279\u5b9a<\/li>\n\n\n\n<li>\u30b3\u30f3\u30d1\u30a4\u30e9\u30aa\u30d7\u30b7\u30e7\u30f3\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u5316<\/li>\n\n\n\n<li>\u30c6\u30b9\u30c8\u74b0\u5883\u3067\u306e\u5341\u5206\u306a\u691c\u8a3c<\/li>\n<\/ol>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u6700\u9069\u5316\u6280\u8853\u3092\u9069\u5207\u306b\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001floor\u95a2\u6570\u306e\u51e6\u7406\u52b9\u7387\u3092\u5927\u5e45\u306b\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002\u305f\u3060\u3057\u3001\u5e38\u306b\u7cbe\u5ea6\u3068\u51e6\u7406\u901f\u5ea6\u306e\u30c8\u30ec\u30fc\u30c9\u30aa\u30d5\u3092\u8003\u616e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-10\">\u30d5\u30ed\u30a2\u95a2\u6570\u306e\u4ee3\u66ff\u624b\u6bb5\u3068\u6bd4\u8f03<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-11\">\u6574\u6570\u30ad\u30e3\u30b9\u30c8\u3068\u30d5\u30ed\u30a2\u95a2\u6570\u306e\u9055\u3044<\/h3>\n\n\n\n<p>\u6574\u6570\u30ad\u30e3\u30b9\u30c8\u3068floor\u95a2\u6570\u306f\u4f3c\u305f\u3088\u3046\u306a\u7d50\u679c\u3092\u8fd4\u3059\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u91cd\u8981\u306a\u9055\u3044\u304c\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u8a73\u7d30\u306a\u6bd4\u8f03\u3068\u5b9f\u88c5\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;cmath&gt;\n#include &lt;iostream&gt;\n#include &lt;iomanip&gt;\n\nvoid compare_floor_and_cast() {\n    \/\/ \u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u306e\u6e96\u5099\n    double test_values[] = {\n        3.7,   \/\/ \u6b63\u306e\u5c0f\u6570\n        -3.7,  \/\/ \u8ca0\u306e\u5c0f\u6570\n        3.0,   \/\/ \u6b63\u306e\u6574\u6570\n        -3.0,  \/\/ \u8ca0\u306e\u6574\u6570\n        0.0,   \/\/ \u30bc\u30ed\n        0.1,   \/\/ \u5c0f\u3055\u3044\u6b63\u306e\u6570\n        -0.1   \/\/ \u5c0f\u3055\u3044\u8ca0\u306e\u6570\n    };\n\n    std::cout &lt;&lt; std::fixed &lt;&lt; std::setprecision(1);\n    std::cout &lt;&lt; \"\u5024\\t\\tfloor()\\t\u30ad\u30e3\u30b9\u30c8\\t\u9055\u3044\\n\";\n    std::cout &lt;&lt; \"----------------------------------------\\n\";\n\n    for (double val : test_values) {\n        double floor_result = std::floor(val);\n        int cast_result = static_cast&lt;int&gt;(val);\n\n        std::cout &lt;&lt; val &lt;&lt; \"\\t\\t\" \n                 &lt;&lt; floor_result &lt;&lt; \"\\t\"\n                 &lt;&lt; cast_result &lt;&lt; \"\\t\\t\";\n\n        if (floor_result != cast_result) {\n            std::cout &lt;&lt; \"\u7570\u306a\u308b\";\n        } else {\n            std::cout &lt;&lt; \"\u540c\u3058\";\n        }\n        std::cout &lt;&lt; std::endl;\n    }\n}\n\nint main() {\n    compare_floor_and_cast();\n    return 0;\n}<\/pre>\n\n\n\n<p>\u4e3b\u306a\u9055\u3044\u306e\u6bd4\u8f03\u8868\uff1a<\/p>\n\n\n<div id=\"id-67541a8e-511a-4947-8804-6f9ef3066dae\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u7279\u5fb4<\/th><th>floor\u95a2\u6570<\/th><th>\u6574\u6570\u30ad\u30e3\u30b9\u30c8<\/th><\/tr><\/thead><tbody><tr><td>\u623b\u308a\u5024\u306e\u578b<\/td><td>double<\/td><td>int<\/td><\/tr><tr><td>\u8ca0\u306e\u6570\u306e\u6319\u52d5<\/td><td>\u6b21\u306e\u5c0f\u3055\u3044\u6574\u6570<\/td><td>0\u65b9\u5411\u3078\u306e\u5207\u308a\u6368\u3066<\/td><\/tr><tr><td>\u7cbe\u5ea6<\/td><td>IEEE-754\u6e96\u62e0<\/td><td>\u5b9f\u88c5\u4f9d\u5b58<\/td><\/tr><tr><td>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/td><td>\u3084\u3084\u9045\u3044<\/td><td>\u9ad8\u901f<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"i-12\">trunc\u95a2\u6570\u3068\u306e\u4f7f\u3044\u5206\u3051<\/h3>\n\n\n\n<p>trunc\u95a2\u6570\u306f\u3001floor\u3068\u306f\u7570\u306a\u308b\u5207\u308a\u6368\u3066\u65b9\u5f0f\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u4e21\u8005\u306e\u9055\u3044\u3068\u9069\u5207\u306a\u4f7f\u7528\u5834\u9762\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;cmath&gt;\n#include &lt;iostream&gt;\n#include &lt;vector&gt;\n\nvoid compare_floor_and_trunc() {\n    \/\/ \u6bd4\u8f03\u7528\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\n    std::vector&lt;double&gt; test_values = {\n        3.7, -3.7,    \/\/ \u57fa\u672c\u7684\u306a\u30b1\u30fc\u30b9\n        0.3, -0.3,    \/\/ 0\u306b\u8fd1\u3044\u5024\n        4.0, -4.0,    \/\/ \u6574\u6570\u5024\n        3.999, -3.999 \/\/ \u5883\u754c\u5024\n    };\n\n    std::cout &lt;&lt; std::fixed &lt;&lt; std::setprecision(3);\n    std::cout &lt;&lt; \"\u5165\u529b\u5024\\t\\tfloor()\\t\\ttrunc()\\t\\t\u9055\u3044\\n\";\n    std::cout &lt;&lt; \"------------------------------------------------\\n\";\n\n    for (double val : test_values) {\n        double floor_result = std::floor(val);\n        double trunc_result = std::trunc(val);\n\n        std::cout &lt;&lt; val &lt;&lt; \"\\t\\t\"\n                 &lt;&lt; floor_result &lt;&lt; \"\\t\\t\"\n                 &lt;&lt; trunc_result &lt;&lt; \"\\t\\t\";\n\n        if (floor_result != trunc_result) {\n            std::cout &lt;&lt; \"\u3042\u308a\";\n        } else {\n            std::cout &lt;&lt; \"\u306a\u3057\";\n        }\n        std::cout &lt;&lt; std::endl;\n    }\n}\n\nint main() {\n    compare_floor_and_trunc();\n    return 0;\n}<\/pre>\n\n\n\n<p>floor\u95a2\u6570\u3068trunc\u95a2\u6570\u306e\u4f7f\u3044\u5206\u3051\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>floor\u95a2\u6570\u306e\u9069\u7528\u5834\u9762\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6570\u5b66\u7684\u306a\u5e8a\u95a2\u6570\u304c\u5fc5\u8981\u306a\u5834\u5408<\/li>\n\n\n\n<li>\u8ca0\u306e\u7121\u9650\u5927\u65b9\u5411\u3078\u306e\u4e38\u3081\u304c\u5fc5\u8981\u306a\u5834\u5408<\/li>\n\n\n\n<li>\u533a\u9593\u6f14\u7b97\u3067\u306e\u4e0b\u9650\u5024\u306e\u8a08\u7b97<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>trunc\u95a2\u6570\u306e\u9069\u7528\u5834\u9762\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5358\u7d14\u306a\u5c0f\u6570\u90e8\u5206\u306e\u9664\u53bb\u304c\u76ee\u7684\u306e\u5834\u5408<\/li>\n\n\n\n<li>\u30bc\u30ed\u65b9\u5411\u3078\u306e\u4e38\u3081\u304c\u5fc5\u8981\u306a\u5834\u5408<\/li>\n\n\n\n<li>\u7b26\u53f7\u306b\u4f9d\u5b58\u3057\u306a\u3044\u4e00\u8cab\u3057\u305f\u52d5\u4f5c\u304c\u5fc5\u8981\u306a\u5834\u5408<\/li>\n<\/ul>\n\n\n\n<p>\u4f7f\u7528\u4e0a\u306e\u6ce8\u610f\u70b9\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8ca0\u306e\u6570\u306e\u51e6\u7406\u304c\u91cd\u8981\u306a\u5834\u5408\u306f\u7279\u306b\u6ce8\u610f<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u91cd\u8996\u3059\u308b\u5834\u5408\u306f\u4e8b\u524d\u306b\u30d9\u30f3\u30c1\u30de\u30fc\u30af<\/li>\n\n\n\n<li>\u7cbe\u5ea6\u8981\u4ef6\u306b\u5fdc\u3058\u3066\u9069\u5207\u306a\u95a2\u6570\u3092\u9078\u629e<\/li>\n\n\n\n<li>\u6d6e\u52d5\u5c0f\u6570\u70b9\u306e\u8aa4\u5dee\u3092\u8003\u616e\u3057\u305f\u5b9f\u88c5<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u4ee3\u66ff\u624b\u6bb5\u306e\u7406\u89e3\u306f\u3001\u9069\u5207\u306a\u95a2\u6570\u9078\u629e\u3068\u52b9\u7387\u7684\u306a\u5b9f\u88c5\u306b\u4e0d\u53ef\u6b20\u3067\u3059\u3002\u7279\u306b\u3001\u8ca0\u306e\u6570\u306e\u51e6\u7406\u3084\u7cbe\u5ea6\u8981\u4ef6\u304c\u91cd\u8981\u306a\u5834\u9762\u3067\u306f\u3001\u5404\u95a2\u6570\u306e\u7279\u6027\u3092\u5341\u5206\u306b\u7406\u89e3\u3057\u305f\u4e0a\u3067\u9078\u629e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-13\">\u4e00\u822c\u7684\u306a\u30a8\u30e9\u30fc\u3068\u89e3\u6c7a\u65b9\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-14\">\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306e\u4e3b\u306a\u539f\u56e0\u3068\u5bfe\u51e6\u6cd5<\/h3>\n\n\n\n<p>floor\u95a2\u6570\u4f7f\u7528\u6642\u306b\u767a\u751f\u3059\u308b\u4e00\u822c\u7684\u306a\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u3068\u305d\u306e\u89e3\u6c7a\u65b9\u6cd5\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;cmath&gt;\n#include &lt;iostream&gt;\n\n\/\/ \u3088\u304f\u3042\u308b\u554f\u984c\u3068\u89e3\u6c7a\u4f8b\nvoid demonstrate_common_errors() {\n    \/\/ \u30a8\u30e9\u30fc\u4f8b1: \u30d8\u30c3\u30c0\u30fc\u30d5\u30a1\u30a4\u30eb\u306e\u4e0d\u8db3\n    \/\/ error: 'floor' was not declared in this scope\n    double x = 3.14;\n    \/\/ \u8aa4: floor(x);\n    \/\/ \u6b63: std::floor(x);  \/\/ &lt;cmath&gt;\u306e\u30a4\u30f3\u30af\u30eb\u30fc\u30c9\u304c\u5fc5\u8981\n\n    \/\/ \u30a8\u30e9\u30fc\u4f8b2: \u540d\u524d\u7a7a\u9593\u306e\u554f\u984c\n    \/\/ error: reference to 'floor' is ambiguous\n    using namespace std;  \/\/ \u907f\u3051\u308b\u3079\u304d\n    \/\/ \u4ee3\u308f\u308a\u306b:\n    using std::floor;     \/\/ \u63a8\u5968\n\n    \/\/ \u30a8\u30e9\u30fc\u4f8b3: \u578b\u306e\u4e0d\u4e00\u81f4\n    int integer_value = 42;\n    \/\/ \u8aa4: std::floor(integer_value);  \/\/ \u8b66\u544a\u304c\u51fa\u308b\u53ef\u80fd\u6027\n    \/\/ \u6b63: std::floor(static_cast&lt;double&gt;(integer_value));\n\n    \/\/ \u30a8\u30e9\u30fc\u4f8b4: \u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u89e3\u6c7a\u306e\u554f\u984c\n    float f_value = 3.14f;\n    \/\/ \u8aa4: int result = std::floor(f_value);  \/\/ \u6697\u9ed9\u306e\u578b\u5909\u63db\n    \/\/ \u6b63: double result = std::floor(f_value);\n}\n\n\/\/ \u30a8\u30e9\u30fc\u56de\u907f\u306e\u305f\u3081\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\nvoid demonstrate_best_practices() {\n    \/\/ 1. \u660e\u793a\u7684\u306a\u578b\u6307\u5b9a\n    double value = 3.14;\n    double floor_result = std::floor(value);  \/\/ \u578b\u304c\u660e\u78ba\n\n    \/\/ 2. \u9069\u5207\u306a\u4f8b\u5916\u51e6\u7406\n    try {\n        double large_value = std::numeric_limits&lt;double&gt;::max();\n        double result = std::floor(large_value);\n        if (std::isinf(result)) {\n            std::cout &lt;&lt; \"\u8b66\u544a: \u7121\u9650\u5927\u304c\u691c\u51fa\u3055\u308c\u307e\u3057\u305f\\n\";\n        }\n    } catch (const std::exception&amp; e) {\n        std::cerr &lt;&lt; \"\u30a8\u30e9\u30fc: \" &lt;&lt; e.what() &lt;&lt; std::endl;\n    }\n}<\/pre>\n\n\n\n<p>\u4e00\u822c\u7684\u306a\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306e\u5bfe\u51e6\u6cd5\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d8\u30c3\u30c0\u30fc\u30d5\u30a1\u30a4\u30eb\u306e\u78ba\u8a8d<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>&lt;cmath&gt;<\/code>\u306e\u30a4\u30f3\u30af\u30eb\u30fc\u30c9\u3092\u78ba\u8a8d<\/li>\n\n\n\n<li>\u53e4\u3044<code>&lt;math.h&gt;<\/code>\u304b\u3089\u306e\u79fb\u884c\u3092\u63a8\u5968<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u540d\u524d\u7a7a\u9593\u306e\u9069\u5207\u306a\u4f7f\u7528<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>std::<\/code>\u306e\u660e\u793a\u7684\u306a\u6307\u5b9a<\/li>\n\n\n\n<li>\u7279\u5b9a\u306e\u95a2\u6570\u306e\u307f\u3092using\u5ba3\u8a00<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u578b\u306e\u4e00\u8cab\u6027\u78ba\u4fdd<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9069\u5207\u306a\u578b\u5909\u63db\u306e\u4f7f\u7528<\/li>\n\n\n\n<li>\u623b\u308a\u5024\u306e\u578b\u306e\u660e\u793a\u7684\u306a\u6307\u5b9a<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-15\">\u7cbe\u5ea6\u306e\u554f\u984c\u3068\u6d6e\u52d5\u5c0f\u6570\u70b9\u6f14\u7b97\u306e\u6ce8\u610f\u70b9<\/h3>\n\n\n\n<p>\u6d6e\u52d5\u5c0f\u6570\u70b9\u6f14\u7b97\u306b\u304a\u3051\u308b\u7cbe\u5ea6\u306e\u554f\u984c\u3068\u3001\u305d\u306e\u5bfe\u51e6\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;cmath&gt;\n#include &lt;iostream&gt;\n#include &lt;iomanip&gt;\n#include &lt;limits&gt;\n\nvoid demonstrate_precision_issues() {\n    std::cout &lt;&lt; std::fixed &lt;&lt; std::setprecision(15);\n\n    \/\/ \u7cbe\u5ea6\u306e\u554f\u984c\u4f8b1: \u6d6e\u52d5\u5c0f\u6570\u70b9\u306e\u8aa4\u5dee\n    double value = 2.1;\n    double floor_value = std::floor(value);\n    double diff = value - floor_value;\n\n    std::cout &lt;&lt; \"\u5024: \" &lt;&lt; value &lt;&lt; std::endl;\n    std::cout &lt;&lt; \"floor\u5f8c: \" &lt;&lt; floor_value &lt;&lt; std::endl;\n    std::cout &lt;&lt; \"\u5dee\u5206: \" &lt;&lt; diff &lt;&lt; std::endl;\n\n    \/\/ \u7cbe\u5ea6\u306e\u554f\u984c\u4f8b2: \u03b5\u3092\u4f7f\u7528\u3057\u305f\u6bd4\u8f03\n    const double epsilon = std::numeric_limits&lt;double&gt;::epsilon();\n    double test_value = 3.0 + epsilon;\n\n    if (std::abs(test_value - std::floor(test_value)) &lt; epsilon) {\n        std::cout &lt;&lt; \"\u6574\u6570\u3068\u307f\u306a\u305b\u308b\u5024\u3067\u3059\\n\";\n    }\n\n    \/\/ \u7cbe\u5ea6\u306e\u554f\u984c\u4f8b3: \u5927\u304d\u306a\u6570\u5024\u3067\u306e\u7cbe\u5ea6\u4f4e\u4e0b\n    double large_value = 1e15;\n    double small_delta = 0.1;\n    double result = std::floor(large_value + small_delta);\n    std::cout &lt;&lt; \"\u5927\u304d\u306a\u6570\u5024\u3067\u306e\u7d50\u679c: \" &lt;&lt; result &lt;&lt; std::endl;\n}\n\n\/\/ \u7cbe\u5ea6\u554f\u984c\u3078\u306e\u5bfe\u51e6\u4f8b\nvoid handle_precision_issues() {\n    \/\/ 1. \u30b9\u30b1\u30fc\u30ea\u30f3\u30b0\u306b\u3088\u308b\u7cbe\u5ea6\u5411\u4e0a\n    double value = 123.456789;\n    double scale = 1000.0;  \/\/ \u5c0f\u6570\u7b2c3\u4f4d\u307e\u3067\u4fdd\u6301\n    double scaled_result = std::floor(value * scale) \/ scale;\n\n    \/\/ 2. \u6bd4\u8f03\u6642\u306e\u30a4\u30d7\u30b7\u30ed\u30f3\u4f7f\u7528\n    double a = 3.14159;\n    double b = std::floor(a);\n    const double epsilon = 1e-10;\n    bool is_nearly_integer = std::abs(a - b) &lt; epsilon;\n\n    \/\/ 3. \u6709\u52b9\u6841\u6570\u306e\u7ba1\u7406\n    std::cout &lt;&lt; std::setprecision(6);  \/\/ \u6709\u52b9\u6841\u6570\u306e\u5236\u9650\n}<\/pre>\n\n\n\n<p>\u7cbe\u5ea6\u554f\u984c\u3078\u306e\u5bfe\u51e6\u65b9\u6cd5\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u9069\u5207\u306a\u03b5\u306e\u9078\u629e<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7528\u9014\u306b\u5fdc\u3058\u305f\u95be\u5024\u306e\u8a2d\u5b9a<\/li>\n\n\n\n<li>\u6570\u5024\u306e\u5927\u304d\u3055\u306b\u5fdc\u3058\u305f\u8abf\u6574<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b9\u30b1\u30fc\u30ea\u30f3\u30b0\u6280\u8853<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5fc5\u8981\u306a\u7cbe\u5ea6\u306b\u5fdc\u3058\u305f\u30b9\u30b1\u30fc\u30eb\u4fc2\u6570\u306e\u9078\u629e<\/li>\n\n\n\n<li>\u4e38\u3081\u8aa4\u5dee\u306e\u6700\u5c0f\u5316<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u6709\u52b9\u6841\u6570\u306e\u7ba1\u7406<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u51fa\u529b\u7cbe\u5ea6\u306e\u9069\u5207\u306a\u8a2d\u5b9a<\/li>\n\n\n\n<li>\u4e2d\u9593\u8a08\u7b97\u3067\u306e\u7cbe\u5ea6\u7dad\u6301<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30a8\u30e9\u30fc\u5bfe\u51e6\u3068\u7cbe\u5ea6\u7ba1\u7406\u306e\u6280\u8853\u3092\u9069\u5207\u306b\u9069\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u4fe1\u983c\u6027\u306e\u9ad8\u3044\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u7279\u306b\u91d1\u878d\u8a08\u7b97\u3084\u79d1\u5b66\u6280\u8853\u8a08\u7b97\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u8003\u616e\u304c\u6975\u3081\u3066\u91cd\u8981\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-16\">\u5b9f\u52d9\u3067\u306e\u6d3b\u7528\u4e8b\u4f8b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-17\">\u91d1\u878d\u8a08\u7b97\u3067\u306e\u6b63\u78ba\u306a\u6570\u5024\u306e\u5207\u308a\u6368\u3066\u51e6\u7406<\/h3>\n\n\n\n<p>\u91d1\u878d\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u306efloor\u95a2\u6570\u306e\u6d3b\u7528\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002\u7279\u306b\u3001\u901a\u8ca8\u8a08\u7b97\u306b\u304a\u3051\u308b\u7aef\u6570\u51e6\u7406\u3067\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;cmath&gt;\n#include &lt;iostream&gt;\n#include &lt;iomanip&gt;\n#include &lt;string&gt;\n\nclass FinancialCalculator {\nprivate:\n    \/\/ \u901a\u8ca8\u306e\u5c0f\u6570\u70b9\u4ee5\u4e0b\u6841\u6570\uff08\u4f8b\uff1a\u5186\u306a\u30890\u3001\u30c9\u30eb\u306a\u30892\uff09\n    const int decimal_places;\n    const double scale_factor;\n\npublic:\n    FinancialCalculator(int decimals) \n        : decimal_places(decimals), \n          scale_factor(std::pow(10.0, decimals)) {}\n\n    \/\/ \u91d1\u984d\u306e\u5207\u308a\u6368\u3066\u51e6\u7406\n    double floor_amount(double amount) {\n        return std::floor(amount * scale_factor) \/ scale_factor;\n    }\n\n    \/\/ \u7a0e\u91d1\u8a08\u7b97\uff08\u5207\u308a\u6368\u3066\uff09\n    double calculate_tax(double amount, double tax_rate) {\n        double tax = amount * tax_rate;\n        return floor_amount(tax);\n    }\n\n    \/\/ \u8907\u6570\u901a\u8ca8\u9593\u306e\u63db\u7b97\uff08\u5207\u308a\u6368\u3066\uff09\n    double convert_currency(double amount, double exchange_rate) {\n        double converted = amount * exchange_rate;\n        return floor_amount(converted);\n    }\n};\n\n\/\/ \u4f7f\u7528\u4f8b\nvoid demonstrate_financial_calculations() {\n    FinancialCalculator yen_calc(0);    \/\/ \u5186\u306e\u8a08\u7b97\n    FinancialCalculator usd_calc(2);    \/\/ \u30c9\u30eb\u306e\u8a08\u7b97\n\n    double price_yen = 1234.56;\n    double price_usd = 12.34;\n    double tax_rate = 0.10;  \/\/ 10%\n    double exchange_rate = 110.0;  \/\/ 1\u30c9\u30eb = 110\u5186\n\n    std::cout &lt;&lt; std::fixed &lt;&lt; std::setprecision(2);\n    std::cout &lt;&lt; \"\u65e5\u672c\u5186\u3067\u306e\u8a08\u7b97:\\n\";\n    std::cout &lt;&lt; \"\u5143\u306e\u91d1\u984d: \" &lt;&lt; price_yen &lt;&lt; \"\u5186\\n\";\n    std::cout &lt;&lt; \"\u5207\u308a\u6368\u3066\u5f8c: \" &lt;&lt; yen_calc.floor_amount(price_yen) &lt;&lt; \"\u5186\\n\";\n    std::cout &lt;&lt; \"\u6d88\u8cbb\u7a0e(10%): \" &lt;&lt; yen_calc.calculate_tax(price_yen, tax_rate) &lt;&lt; \"\u5186\\n\";\n\n    std::cout &lt;&lt; \"\\n\u30c9\u30eb\u3067\u306e\u8a08\u7b97:\\n\";\n    std::cout &lt;&lt; \"\u5143\u306e\u91d1\u984d: $\" &lt;&lt; price_usd &lt;&lt; \"\\n\";\n    std::cout &lt;&lt; \"\u5207\u308a\u6368\u3066\u5f8c: $\" &lt;&lt; usd_calc.floor_amount(price_usd) &lt;&lt; \"\\n\";\n    std::cout &lt;&lt; \"\u7a0e\u91d1(10%): $\" &lt;&lt; usd_calc.calculate_tax(price_usd, tax_rate) &lt;&lt; \"\\n\";\n}<\/pre>\n\n\n\n<p>\u91d1\u878d\u8a08\u7b97\u3067\u306e\u6ce8\u610f\u70b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u901a\u8ca8\u3054\u3068\u306e\u5c0f\u6570\u70b9\u4ee5\u4e0b\u6841\u6570\u306e\u7ba1\u7406<\/li>\n\n\n\n<li>\u4e38\u3081\u8aa4\u5dee\u306e\u7d2f\u7a4d\u9632\u6b62<\/li>\n\n\n\n<li>\u7570\u306a\u308b\u901a\u8ca8\u9593\u306e\u63db\u7b97\u7cbe\u5ea6<\/li>\n\n\n\n<li>\u7a0e\u91d1\u8a08\u7b97\u3067\u306e\u6cd5\u4ee4\u9075\u5b88<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-18\">\u30b0\u30e9\u30d5\u30a3\u30c3\u30af\u30b9\u51e6\u7406\u3067\u306e\u5ea7\u6a19\u8a08\u7b97\u306b\u304a\u3051\u308b\u4f7f\u7528\u4f8b<\/h3>\n\n\n\n<p>\u30b0\u30e9\u30d5\u30a3\u30c3\u30af\u30b9\u51e6\u7406\u3067\u306efloor\u95a2\u6570\u306e\u6d3b\u7528\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002\u7279\u306b\u30d4\u30af\u30bb\u30eb\u5ea7\u6a19\u306e\u8a08\u7b97\u3067\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;cmath&gt;\n#include &lt;iostream&gt;\n#include &lt;vector&gt;\n\nclass GraphicsProcessor {\nprivate:\n    const int screen_width;\n    const int screen_height;\n\npublic:\n    GraphicsProcessor(int width, int height)\n        : screen_width(width), screen_height(height) {}\n\n    \/\/ \u5b9f\u6570\u5ea7\u6a19\u304b\u3089\u30d4\u30af\u30bb\u30eb\u5ea7\u6a19\u3078\u306e\u5909\u63db\n    struct PixelCoord {\n        int x, y;\n    };\n\n    \/\/ \u8ad6\u7406\u5ea7\u6a19\u304b\u3089\u30d4\u30af\u30bb\u30eb\u5ea7\u6a19\u3078\u306e\u5909\u63db\n    PixelCoord to_pixel_coords(double logical_x, double logical_y) {\n        \/\/ \u8ad6\u7406\u5ea7\u6a19\u7cfb\u304b\u3089\u30b9\u30af\u30ea\u30fc\u30f3\u5ea7\u6a19\u7cfb\u3078\u306e\u5909\u63db\n        int pixel_x = static_cast&lt;int&gt;(std::floor(logical_x));\n        int pixel_y = static_cast&lt;int&gt;(std::floor(logical_y));\n\n        \/\/ \u753b\u9762\u7bc4\u56f2\u5185\u306b\u53ce\u3081\u308b\n        pixel_x = std::max(0, std::min(pixel_x, screen_width - 1));\n        pixel_y = std::max(0, std::min(pixel_y, screen_height - 1));\n\n        return {pixel_x, pixel_y};\n    }\n\n    \/\/ \u30a2\u30f3\u30c1\u30a8\u30a4\u30ea\u30a2\u30b7\u30f3\u30b0\u7528\u306e\u30b5\u30d6\u30d4\u30af\u30bb\u30eb\u8a08\u7b97\n    double calculate_subpixel_coverage(double edge_position) {\n        double fraction = edge_position - std::floor(edge_position);\n        return 1.0 - fraction;  \/\/ \u30ab\u30d0\u30fc\u7387\u306e\u8a08\u7b97\n    }\n\n    \/\/ \u30c6\u30af\u30b9\u30c1\u30e3\u30de\u30c3\u30d4\u30f3\u30b0\u3067\u306e\u30c6\u30af\u30bb\u30eb\u5ea7\u6a19\u8a08\u7b97\n    struct TexelCoord {\n        int u, v;\n        double weight;  \/\/ \u30d0\u30a4\u30ea\u30cb\u30a2\u88dc\u9593\u306e\u91cd\u307f\n    };\n\n    TexelCoord calculate_texel_coord(double u, double v) {\n        int base_u = static_cast&lt;int&gt;(std::floor(u));\n        int base_v = static_cast&lt;int&gt;(std::floor(v));\n        double weight_u = u - base_u;\n        double weight_v = v - base_v;\n\n        return {base_u, base_v, weight_u * weight_v};\n    }\n};\n\n\/\/ \u4f7f\u7528\u4f8b\nvoid demonstrate_graphics_processing() {\n    GraphicsProcessor gp(1920, 1080);  \/\/ Full HD\u89e3\u50cf\u5ea6\n\n    \/\/ \u8ad6\u7406\u5ea7\u6a19\u304b\u3089\u30d4\u30af\u30bb\u30eb\u5ea7\u6a19\u3078\u306e\u5909\u63db\u4f8b\n    double logical_x = 123.7;\n    double logical_y = 456.2;\n    auto pixel_coord = gp.to_pixel_coords(logical_x, logical_y);\n    std::cout &lt;&lt; \"\u30d4\u30af\u30bb\u30eb\u5ea7\u6a19: (\" &lt;&lt; pixel_coord.x &lt;&lt; \", \" \n              &lt;&lt; pixel_coord.y &lt;&lt; \")\\n\";\n\n    \/\/ \u30b5\u30d6\u30d4\u30af\u30bb\u30eb\u30ab\u30d0\u30ec\u30c3\u30b8\u306e\u8a08\u7b97\u4f8b\n    double edge_pos = 10.7;\n    double coverage = gp.calculate_subpixel_coverage(edge_pos);\n    std::cout &lt;&lt; \"\u30b5\u30d6\u30d4\u30af\u30bb\u30eb\u30ab\u30d0\u30ec\u30c3\u30b8: \" &lt;&lt; coverage &lt;&lt; \"\\n\";\n\n    \/\/ \u30c6\u30af\u30bb\u30eb\u5ea7\u6a19\u306e\u8a08\u7b97\u4f8b\n    double u = 0.7;\n    double v = 0.3;\n    auto texel = gp.calculate_texel_coord(u, v);\n    std::cout &lt;&lt; \"\u30c6\u30af\u30bb\u30eb\u5ea7\u6a19: (\" &lt;&lt; texel.u &lt;&lt; \", \" \n              &lt;&lt; texel.v &lt;&lt; \") \u91cd\u307f: \" &lt;&lt; texel.weight &lt;&lt; \"\\n\";\n}<\/pre>\n\n\n\n<p>\u30b0\u30e9\u30d5\u30a3\u30c3\u30af\u30b9\u51e6\u7406\u3067\u306e\u6d3b\u7528\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d4\u30af\u30bb\u30eb\u5883\u754c\u306e\u6b63\u78ba\u306a\u8a08\u7b97<\/li>\n\n\n\n<li>\u30a2\u30f3\u30c1\u30a8\u30a4\u30ea\u30a2\u30b7\u30f3\u30b0\u51e6\u7406\u3067\u306e\u7cbe\u5ea6\u7ba1\u7406<\/li>\n\n\n\n<li>\u30c6\u30af\u30b9\u30c1\u30e3\u30de\u30c3\u30d4\u30f3\u30b0\u3067\u306e\u5ea7\u6a19\u5909\u63db<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u7cbe\u5ea6\u306e\u30d0\u30e9\u30f3\u30b9<\/li>\n<\/ol>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u5b9f\u52d9\u4e8b\u4f8b\u306f\u3001floor\u95a2\u6570\u304c\u5b9f\u969b\u306e\u30d3\u30b8\u30cd\u30b9\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u3044\u304b\u306b\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u3066\u3044\u308b\u304b\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u7279\u306b\u91d1\u878d\u3084\u30b0\u30e9\u30d5\u30a3\u30c3\u30af\u30b9\u51e6\u7406\u306a\u3069\u3001\u9ad8\u7cbe\u5ea6\u306a\u8a08\u7b97\u304c\u8981\u6c42\u3055\u308c\u308b\u5834\u9762\u3067\u306e\u9069\u5207\u306a\u4f7f\u7528\u65b9\u6cd5\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Warning: Undefined array key &#8220;is_admin&#8221; in \/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/ &#8230; <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":{"0":"post-2171","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-cpp","7":"nothumb"},"_links":{"self":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/2171","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2171"}],"version-history":[{"count":1,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/2171\/revisions"}],"predecessor-version":[{"id":2172,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/2171\/revisions\/2172"}],"wp:attachment":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2171"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2171"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2171"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}